JavaScript operators are used to assign values, compare values, perform arithmetic operations, and more.
Arithmetic operators are used to perform arithmetic between variables and/or values.
Given that y = 5, the table below explains the arithmetic operators:
| Operator | Description | Example | Result in y | Result in x | Try it |
|---|---|---|---|---|---|
| + | Addition | x = y + 2 | y = 5 | x = 7 | Try it » |
| - | Subtraction | x = y - 2 | y = 5 | x = 3 | Try it » |
| * | Multiplication | x = y * 2 | y = 5 | x = 10 | Try it » |
| / | Division | x = y / 2 | y = 5 | x = 2.5 | Try it » |
| % | Modulus (division remainder) | x = y % 2 | y = 5 | x = 1 | Try it » |
| ++ | Increment | x = ++y | y = 6 | x = 6 | Try it » |
| x = y++ | y = 6 | x = 5 | Try it » | ||
| -- | Decrement | x = --y | y = 4 | x = 4 | Try it » |
| x = y-- | y = 4 | x = 5 | Try it » |
For a tutorial about arithmetic operators, read our JavaScript Operators Tutorial.
Assignment operators are used to assign values to JavaScript variables.
Given that x = 10 and y = 5, the table below explains the assignment operators:
| Operator | Example | Same As | Result in x | Try it |
|---|---|---|---|---|
| = | x = y | x = y | x = 5 | Try it » |
| += | x += y | x = x + y | x = 15 | Try it » |
| -= | x -= y | x = x - y | x = 5 | Try it » |
| *= | x *= y | x = x * y | x = 50 | Try it » |
| /= | x /= y | x = x / y | x = 2 | Try it » |
| %= | x %= y | x = x % y | x = 0 | Try it » |
For a tutorial about assignment operators, read our JavaScript Operators Tutorial.
The + operator, and the += operator can also be used to concatenate (add) strings.
Given that text1 = "Good ", text2 = "Morning", and text3 = "", the table below explains the operators:
| Operator | Example | text1 | text2 | text3 | Try it |
|---|---|---|---|---|---|
| + | text3 = text1 + text2 | "Good " | "Morning" | "Good Morning" | Try it » |
| += | text1 += text2 | "Good " | "Morning" | "" | Try it » |
Comparison operators are used in logical statements to determine equality or difference between variables or values.
Given that x = 5, the table below explains the comparison operators:
| Operator | Description | Comparing | Returns | Try it |
|---|---|---|---|---|
| == | equal to | x == 8 | false | Try it » |
| x == 5 | true | Try it » | ||
| === | equal value and equal type | x === "5" | false | Try it » |
| x === 5 | true | Try it » | ||
| != | not equal | x != 8 | true | Try it » |
| !== | not equal value or not equal type | x !== "5" | true | Try it » |
| x !== 5 | false | Try it » | ||
| > | greater than | x > 8 | false | Try it » |
| < | less than | x < 8 | true | Try it » |
| >= | greater than or equal to | x >= 8 | false | Try it » |
| <= | less than or equal to | x <= 8 | true | Try it » |
For a tutorial about comparison operators, read our JavaScript Comparisons Tutorial.
The conditional operator assigns a value to a variable based on a condition.
| Syntax | Example | Try it |
|---|---|---|
| variablename = (condition) ? value1:value2 | voteable = (age < 18) ? "Too young":"Old enough"; | Try it » |
Example explained: If the variable "age" is a value below 18, the value of the variable "voteable" will be "Too young", otherwise the value of voteable will be "Old enough".
Logical operators are used to determine the logic between variables or values.
Given that x = 6 and y = 3, the table below explains the logical operators:
| Operator | Description | Example |
|---|---|---|
| && | and | (x < 10 && y > 1) is true |
| || | or | (x == 5 || y == 5) is false |
| ! | not | !(x == y) is true |
Bit operators work on 32 bits numbers. Any numeric operand in the operation is converted into a 32 bit number. The result is converted back to a JavaScript number.
| Operator | Description | Example | Same as | Result | Decimal |
|---|---|---|---|---|---|
| & | AND | x = 5 & 1 | 0101 & 0001 | 0001 | 1 |
| | | OR | x = 5 | 1 | 0101 | 0001 | 0101 | 5 |
| ~ | NOT | x = ~ 5 | ~0101 | 1010 | 10 |
| ^ | XOR | x = 5 ^ 1 | 0101 ^ 0001 | 0100 | 4 |
| << | Left shift | x = 5 << 1 | 0101 << 1 | 1010 | 10 |
| >> | Right shift | x = 5 >> 1 | 0101 >> 1 | 0010 | 2 |
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